Why does Appointments+ distort the tables on our page?

We downloaded your appointments+ plugin yesterday but it appears to have interfered with the tables on our pages. The spacing became distorted despite the fact that the code wasn’t change. Once I deactivated the plugin our tables were restored. Is there a way for us to use this plugin without compromising the formatting of our tables? Our site is Shusterman.com. For an example of a page with a table, see http://shusterman.com/statedepartmentvisabulletin.html.